weight.m

这是一个不错的图像压缩的Matlab程序,希望能对你有所帮助.

function [threshold,laststeplevel]=Weight(A)
%计算权值函数
X=A;
Y0=max(abs(X));
     Y1=max(Y0); 
     for i=0:20;
        if 2^i<=Y1 & 2^(i+1)>Y1;
           threshold=2^i;   % get initial threshold T0;
           %initialthreshold=threshold; % get initial threshold T0;
           laststeplevel=i;% last step level
           break;
        end;
     end;